NVMe: RCU protected access to io queues
This adds rcu protected access to nvme_queue to fix a race between a surprise removal freeing the queue and a thread with open reference on a NVMe block device using that queue. The queues do not need to be rcu protected during the initialization or shutdown parts, so I've added a helper function for raw deferencing to get around the sparse errors. There is still a hole in the IOCTL path for the same problem, which is fixed in a subsequent patch. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
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